Device for sharpening pencils



Patented pr. 9,4 1922.

ERNST FRIEDEZKY, or morren, ozncnosnov f ASSIGNOR T0 THE FIRM RQSIER- KLNGENFAIBBIK RIVQ HAHN, RICHTER &'VOLKMANN, OF TBOPPAU, CZECHO- SLOVAKIA.

v Application led July 26, 1927, Serial No'.

This invention relates to improvements-in devices for sharpening pencils, in which aused safety razor blade is employed as a cutter, and it has for its object to provide means for supporting and holding the blade to se' cure an eilicient cutting action and to render possible the correct adjustment of the blades, which are not always of exactly the same size, and further to secure a firm clamping of the blade in position.

One mode of carrying out the present invention is illustrated byway of example on the accompanying sheet ofy drawings in which. v

Figs. `1 and 2 show in frontview and plan view respectively a pencil-Sharpener embodying my invention the tensioning plate being removed.

Fig. 3 illustrates in transverse section the Sharpener with the tensioning plate secured in position, the section being taken on line III-'III of Fig. 2.

Fig.4 is an inverted plan view of the tensioning plate, and

Fig. 5 'is a transverse section through a portion of the Sharpener von an enlarged scale.

The guide sleeve 1, provided wit-h a conical bore to receive the point end of the pencil, is furnished at one side of the shavings outlet slot lwith an extension inthe shape of a base plate 2, .which is provided with a plain bearing surface for a bearing plate 3, 'furnished with a handle 4. The bearing surface is arranged so as to dispose the outer face of the plate 3 outside of the tangential plane which passes through the `generatrix of the guidesleeve and above the cutting plane. The two plates are connected with one another in such a manner by screws 5,- 5, passing through transverse slots 6 of the plate 2, that vthey can be moved withrespect toone another in the direction transverse to the sleeve. The plate 3 is provided with two projections or raised parts 7 7', corresponding with the outer holes of a safety razor plate provided with three holes (Gillette type). By means of the projections 7 7', a blade placed upon the plate 3 is prevented from shifting with respect to the plate 3 in the direction of its adjustment, so that-the plate 3 and the blade form a unit. At its inner side the plate extends but slightly beyond the holes of the DEVICE FOR ySHAR'PENING- PENCIIS.

208,569, andin Austria March 31, 1927.

blade, so that one edge portion-of the blade projects Without support materially beyond this side of the plate. The'end portions of the cutting edge of the blade, when the latter is in cutting position, rest against two smooth abutment faces 9 of the sleeve, which lie in a plane passing through the axis of the sleevebore vertically with respect to the plates 2, 3. Below the centre holeof the blade, the plate 3 i's provided with an opening 10 and the plate 2/is furnished with a suitable screw-threaded hole 11, in order to secure a tensioning plate "12 by means of a screw 13. At its mner edge, the tensioning plate is provided with a wedge-shaped extension 14, which bears upon the blade near its cutting edge and depresses the latter into the slot of the guide-sleeve, so that shavings or chippings are cut olf of the rotated pencil, the shavings passing out ot' the sleeve by way of its discharge slot. The clamping of the blade, whereby the latter is bent, effects an advantageous stiffening of the thin blade and its tensioning, as will be readily understood. Preferably the arrangement is such, that, when the blade is correctly tensioned, the bottom face of the cutting kedge is disposed parallel with r'espect to the tangential plane passing through the generatrix of the sleeve-bore above the cutting edge. The disposing of the plate 3 upon the plate 2 renders possible also the use of greatly worn blades, which have been rendei-ed irregular by frequent grinding. After sliding the blade against the bearing surfaces 9, the screws 5, 5 can be tightened, so that on applying the tensioning plate and fixing the same by means of the screws 13, the blade cannot be shifted in any way.

encil sharjener for use in connection with sa et razor lades providedwith two or more ho es, comprising a guide sleeve having a conlcal bore and a slot communicating therewith, an extension at one 'side of said sleeve and parallel with said slot, a bearing plate resting on the extension of the sleeve V and having a blade supporting surface lying outwardly beyond the tangential plane 'extending through the generatrix of the guide lying outwardly beyond the cutting plane,

said plate having projections vto "engage the openings-in the blade,'fa blade resting onj.the

supporting surface ofthe bearing plate andv having a portion thereof 'provided with a cutting edge projecting laterally beyond that edge ofthe bearing plate facing the slot so as to dispose said cutting edge in alinement with the slot, a tension plate resting upon the blade and having means for bending the' projectingportion thereof at an inward and downward angle tangential to the generatrix of the sleeve, and means for securing said tension plate in position.

2.. A pencil sharpener of the character set forth 1n claim l wliereln the extension and 1,7os,12s

bearing plate are provided with interengagin;r slots and proJeetions to permit adJustnient of the blade with relation to the slot.

3. A pencil Sharpener of the character set forth in claim 1 wherein that side of the slot opposite the extension is formed with a recess and snrt'acesat the ends of said recess against which the end portions of the cutting edge of the blade bear. l

In testimony whereof I aix my signature. I

ERNST FRIEDEZK Y. 

